[Feature] add GA346 baseline version
Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/kernel/linux/v4.19/drivers/gnss/Kconfig b/src/kernel/linux/v4.19/drivers/gnss/Kconfig
new file mode 100644
index 0000000..73482e8
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/gnss/Kconfig
@@ -0,0 +1,58 @@
+#
+# GNSS receiver configuration
+#
+
+menuconfig GNSS
+ tristate "GNSS receiver support"
+ ---help---
+ Say Y here if you have a GNSS receiver (e.g. a GPS receiver).
+
+ To compile this driver as a module, choose M here: the module will
+ be called gnss.
+
+if GNSS
+
+config GNSS_SERIAL
+ tristate
+
+config GNSS_SIRF_SERIAL
+ tristate "SiRFstar GNSS receiver support"
+ depends on SERIAL_DEV_BUS
+ ---help---
+ Say Y here if you have a SiRFstar-based GNSS receiver which uses a
+ serial interface.
+
+ To compile this driver as a module, choose M here: the module will
+ be called gnss-sirf.
+
+ If unsure, say N.
+
+config GNSS_UBX_SERIAL
+ tristate "u-blox GNSS receiver support"
+ depends on SERIAL_DEV_BUS
+ select GNSS_SERIAL
+ ---help---
+ Say Y here if you have a u-blox GNSS receiver which uses a serial
+ interface.
+
+ To compile this driver as a module, choose M here: the module will
+ be called gnss-ubx.
+
+ If unsure, say N.
+
+config GNSS_CMDLINE_SERIAL
+ tristate "Command line test driver for GNSS"
+ depends on SERIAL_DEV_BUS
+ select GNSS_SERIAL
+ ---help---
+ Say Y here if you want to test the GNSS subsystem but do not have a
+ way to communicate a binding through firmware such as DT or ACPI.
+ The correct serdev device and protocol type must be specified on
+ the module command line.
+
+ To compile this driver as a module, choose M here: the module will
+ be called gnss-cmdline.
+
+ If unsure, say N.
+
+endif # GNSS
diff --git a/src/kernel/linux/v4.19/drivers/gnss/Makefile b/src/kernel/linux/v4.19/drivers/gnss/Makefile
new file mode 100644
index 0000000..d517c30
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/gnss/Makefile
@@ -0,0 +1,19 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the GNSS subsystem.
+#
+
+obj-$(CONFIG_GNSS) += gnss.o
+gnss-y := core.o
+
+obj-$(CONFIG_GNSS_SERIAL) += gnss-serial.o
+gnss-serial-y := serial.o
+
+obj-$(CONFIG_GNSS_SIRF_SERIAL) += gnss-sirf.o
+gnss-sirf-y := sirf.o
+
+obj-$(CONFIG_GNSS_UBX_SERIAL) += gnss-ubx.o
+gnss-ubx-y := ubx.o
+
+obj-$(CONFIG_GNSS_CMDLINE_SERIAL) += gnss-cmdline.o
+gnss-cmdline-y := cmdline.o
diff --git a/src/kernel/linux/v4.19/drivers/gnss/cmdline.c b/src/kernel/linux/v4.19/drivers/gnss/cmdline.c
new file mode 100644
index 0000000..3e1d246
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/gnss/cmdline.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Test driver for GNSS. This driver requires the serdev binding and protocol
+ * type to be specified on the module command line.
+ *
+ * Copyright 2019 Google LLC
+ */
+
+#include <linux/device.h>
+#include <linux/gnss.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/serdev.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include "serial.h"
+
+#define GNSS_CMDLINE_MODULE_NAME "gnss-cmdline"
+
+#define gnss_cmdline_err(...) \
+ pr_err(GNSS_CMDLINE_MODULE_NAME ": " __VA_ARGS__)
+
+static char *serdev;
+module_param(serdev, charp, 0644);
+MODULE_PARM_DESC(serdev, "serial device to wrap");
+
+static int type;
+module_param(type, int, 0644);
+MODULE_PARM_DESC(serdev, "GNSS protocol type (see 'enum gnss_type')");
+
+static struct serdev_device *serdev_device;
+
+static int name_match(struct device *dev, void *data)
+{
+ return strstr(dev_name(dev), data) != NULL;
+}
+
+static int __init gnss_cmdline_init(void)
+{
+ struct device *serial_dev, *port_dev, *serdev_dev;
+ char *driver_name, *port_name, *serdev_name;
+ char *serdev_dup, *serdev_dup_sep;
+ struct gnss_serial *gserial;
+ int err = -ENODEV;
+
+ /* User did not set the serdev module parameter */
+ if (!serdev)
+ return 0;
+
+ if (type < 0 || type >= GNSS_TYPE_COUNT) {
+ gnss_cmdline_err("invalid gnss type '%d'\n", type);
+ return -EINVAL;
+ }
+
+ serdev_dup = serdev_dup_sep = kstrdup(serdev, GFP_KERNEL);
+ if (!serdev_dup)
+ return -ENOMEM;
+
+ driver_name = strsep(&serdev_dup_sep, "/");
+ if (!driver_name) {
+ gnss_cmdline_err("driver name missing\n");
+ goto err_free_serdev_dup;
+ }
+
+ port_name = strsep(&serdev_dup_sep, "/");
+ if (!port_name) {
+ gnss_cmdline_err("port name missing\n");
+ goto err_free_serdev_dup;
+ }
+
+ serdev_name = strsep(&serdev_dup_sep, "/");
+ if (!serdev_name) {
+ gnss_cmdline_err("serdev name missing\n");
+ goto err_free_serdev_dup;
+ }
+
+ /* Find the driver device instance (e.g. serial8250) */
+ serial_dev = bus_find_device_by_name(&platform_bus_type,
+ NULL, driver_name);
+ if (!serial_dev) {
+ gnss_cmdline_err("no device '%s'\n", driver_name);
+ goto err_free_serdev_dup;
+ }
+
+ /* Find the port device instance (e.g. serial0) */
+ port_dev = device_find_child(serial_dev, port_name, name_match);
+ if (!port_dev) {
+ gnss_cmdline_err("no port '%s'\n", port_name);
+ goto err_free_serdev_dup;
+ }
+
+ /* Find the serdev device instance (e.g. serial0-0) */
+ serdev_dev = device_find_child(port_dev, serdev_name, name_match);
+ if (!serdev_dev) {
+ gnss_cmdline_err("no serdev '%s'\n", serdev_name);
+ goto err_free_serdev_dup;
+ }
+
+ gserial = gnss_serial_allocate(to_serdev_device(serdev_dev), 0);
+ if (IS_ERR(gserial)) {
+ err = PTR_ERR(gserial);
+ goto err_free_serdev_dup;
+ }
+
+ gserial->gdev->type = type;
+
+ err = gnss_serial_register(gserial);
+ if (err) {
+ gnss_serial_free(gserial);
+ goto err_free_serdev_dup;
+ }
+
+ serdev_device = to_serdev_device(serdev_dev);
+ err = 0;
+err_free_serdev_dup:
+ kfree(serdev_dup);
+ return err;
+}
+
+static void __exit gnss_cmdline_exit(void)
+{
+ struct gnss_serial *gserial;
+
+ if (!serdev_device)
+ return;
+
+ gserial = serdev_device_get_drvdata(serdev_device);
+
+ gnss_serial_deregister(gserial);
+ gnss_serial_free(gserial);
+}
+
+module_init(gnss_cmdline_init);
+module_exit(gnss_cmdline_exit);
+
+MODULE_AUTHOR("Alistair Delva <adelva@google.com>");
+MODULE_DESCRIPTION("GNSS command line driver");
+MODULE_LICENSE("GPL v2");
diff --git a/src/kernel/linux/v4.19/drivers/gnss/core.c b/src/kernel/linux/v4.19/drivers/gnss/core.c
new file mode 100644
index 0000000..4291a0d
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/gnss/core.c
@@ -0,0 +1,420 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * GNSS receiver core
+ *
+ * Copyright (C) 2018 Johan Hovold <johan@kernel.org>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/cdev.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/gnss.h>
+#include <linux/idr.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/wait.h>
+
+#define GNSS_FLAG_HAS_WRITE_RAW BIT(0)
+
+#define GNSS_MINORS 16
+
+static DEFINE_IDA(gnss_minors);
+static dev_t gnss_first;
+
+/* FIFO size must be a power of two */
+#define GNSS_READ_FIFO_SIZE 4096
+#define GNSS_WRITE_BUF_SIZE 1024
+
+#define to_gnss_device(d) container_of((d), struct gnss_device, dev)
+
+static int gnss_open(struct inode *inode, struct file *file)
+{
+ struct gnss_device *gdev;
+ int ret = 0;
+
+ gdev = container_of(inode->i_cdev, struct gnss_device, cdev);
+
+ get_device(&gdev->dev);
+
+ nonseekable_open(inode, file);
+ file->private_data = gdev;
+
+ down_write(&gdev->rwsem);
+ if (gdev->disconnected) {
+ ret = -ENODEV;
+ goto unlock;
+ }
+
+ if (gdev->count++ == 0) {
+ ret = gdev->ops->open(gdev);
+ if (ret)
+ gdev->count--;
+ }
+unlock:
+ up_write(&gdev->rwsem);
+
+ if (ret)
+ put_device(&gdev->dev);
+
+ return ret;
+}
+
+static int gnss_release(struct inode *inode, struct file *file)
+{
+ struct gnss_device *gdev = file->private_data;
+
+ down_write(&gdev->rwsem);
+ if (gdev->disconnected)
+ goto unlock;
+
+ if (--gdev->count == 0) {
+ gdev->ops->close(gdev);
+ kfifo_reset(&gdev->read_fifo);
+ }
+unlock:
+ up_write(&gdev->rwsem);
+
+ put_device(&gdev->dev);
+
+ return 0;
+}
+
+static ssize_t gnss_read(struct file *file, char __user *buf,
+ size_t count, loff_t *pos)
+{
+ struct gnss_device *gdev = file->private_data;
+ unsigned int copied;
+ int ret;
+
+ mutex_lock(&gdev->read_mutex);
+ while (kfifo_is_empty(&gdev->read_fifo)) {
+ mutex_unlock(&gdev->read_mutex);
+
+ if (gdev->disconnected)
+ return 0;
+
+ if (file->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+
+ ret = wait_event_interruptible(gdev->read_queue,
+ gdev->disconnected ||
+ !kfifo_is_empty(&gdev->read_fifo));
+ if (ret)
+ return -ERESTARTSYS;
+
+ mutex_lock(&gdev->read_mutex);
+ }
+
+ ret = kfifo_to_user(&gdev->read_fifo, buf, count, &copied);
+ if (ret == 0)
+ ret = copied;
+
+ mutex_unlock(&gdev->read_mutex);
+
+ return ret;
+}
+
+static ssize_t gnss_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *pos)
+{
+ struct gnss_device *gdev = file->private_data;
+ size_t written = 0;
+ int ret;
+
+ if (gdev->disconnected)
+ return -EIO;
+
+ if (!count)
+ return 0;
+
+ if (!(gdev->flags & GNSS_FLAG_HAS_WRITE_RAW))
+ return -EIO;
+
+ /* Ignoring O_NONBLOCK, write_raw() is synchronous. */
+
+ ret = mutex_lock_interruptible(&gdev->write_mutex);
+ if (ret)
+ return -ERESTARTSYS;
+
+ for (;;) {
+ size_t n = count - written;
+
+ if (n > GNSS_WRITE_BUF_SIZE)
+ n = GNSS_WRITE_BUF_SIZE;
+
+ if (copy_from_user(gdev->write_buf, buf, n)) {
+ ret = -EFAULT;
+ goto out_unlock;
+ }
+
+ /*
+ * Assumes write_raw can always accept GNSS_WRITE_BUF_SIZE
+ * bytes.
+ *
+ * FIXME: revisit
+ */
+ down_read(&gdev->rwsem);
+ if (!gdev->disconnected)
+ ret = gdev->ops->write_raw(gdev, gdev->write_buf, n);
+ else
+ ret = -EIO;
+ up_read(&gdev->rwsem);
+
+ if (ret < 0)
+ break;
+
+ written += ret;
+ buf += ret;
+
+ if (written == count)
+ break;
+ }
+
+ if (written)
+ ret = written;
+out_unlock:
+ mutex_unlock(&gdev->write_mutex);
+
+ return ret;
+}
+
+static __poll_t gnss_poll(struct file *file, poll_table *wait)
+{
+ struct gnss_device *gdev = file->private_data;
+ __poll_t mask = 0;
+
+ poll_wait(file, &gdev->read_queue, wait);
+
+ if (!kfifo_is_empty(&gdev->read_fifo))
+ mask |= EPOLLIN | EPOLLRDNORM;
+ if (gdev->disconnected)
+ mask |= EPOLLHUP;
+
+ return mask;
+}
+
+static const struct file_operations gnss_fops = {
+ .owner = THIS_MODULE,
+ .open = gnss_open,
+ .release = gnss_release,
+ .read = gnss_read,
+ .write = gnss_write,
+ .poll = gnss_poll,
+ .llseek = no_llseek,
+};
+
+static struct class *gnss_class;
+
+static void gnss_device_release(struct device *dev)
+{
+ struct gnss_device *gdev = to_gnss_device(dev);
+
+ kfree(gdev->write_buf);
+ kfifo_free(&gdev->read_fifo);
+ ida_simple_remove(&gnss_minors, gdev->id);
+ kfree(gdev);
+}
+
+struct gnss_device *gnss_allocate_device(struct device *parent)
+{
+ struct gnss_device *gdev;
+ struct device *dev;
+ int id;
+ int ret;
+
+ gdev = kzalloc(sizeof(*gdev), GFP_KERNEL);
+ if (!gdev)
+ return NULL;
+
+ id = ida_simple_get(&gnss_minors, 0, GNSS_MINORS, GFP_KERNEL);
+ if (id < 0) {
+ kfree(gdev);
+ return NULL;
+ }
+
+ gdev->id = id;
+
+ dev = &gdev->dev;
+ device_initialize(dev);
+ dev->devt = gnss_first + id;
+ dev->class = gnss_class;
+ dev->parent = parent;
+ dev->release = gnss_device_release;
+ dev_set_drvdata(dev, gdev);
+ dev_set_name(dev, "gnss%d", id);
+
+ init_rwsem(&gdev->rwsem);
+ mutex_init(&gdev->read_mutex);
+ mutex_init(&gdev->write_mutex);
+ init_waitqueue_head(&gdev->read_queue);
+
+ ret = kfifo_alloc(&gdev->read_fifo, GNSS_READ_FIFO_SIZE, GFP_KERNEL);
+ if (ret)
+ goto err_put_device;
+
+ gdev->write_buf = kzalloc(GNSS_WRITE_BUF_SIZE, GFP_KERNEL);
+ if (!gdev->write_buf)
+ goto err_put_device;
+
+ cdev_init(&gdev->cdev, &gnss_fops);
+ gdev->cdev.owner = THIS_MODULE;
+
+ return gdev;
+
+err_put_device:
+ put_device(dev);
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(gnss_allocate_device);
+
+void gnss_put_device(struct gnss_device *gdev)
+{
+ put_device(&gdev->dev);
+}
+EXPORT_SYMBOL_GPL(gnss_put_device);
+
+int gnss_register_device(struct gnss_device *gdev)
+{
+ int ret;
+
+ /* Set a flag which can be accessed without holding the rwsem. */
+ if (gdev->ops->write_raw != NULL)
+ gdev->flags |= GNSS_FLAG_HAS_WRITE_RAW;
+
+ ret = cdev_device_add(&gdev->cdev, &gdev->dev);
+ if (ret) {
+ dev_err(&gdev->dev, "failed to add device: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(gnss_register_device);
+
+void gnss_deregister_device(struct gnss_device *gdev)
+{
+ down_write(&gdev->rwsem);
+ gdev->disconnected = true;
+ if (gdev->count) {
+ wake_up_interruptible(&gdev->read_queue);
+ gdev->ops->close(gdev);
+ }
+ up_write(&gdev->rwsem);
+
+ cdev_device_del(&gdev->cdev, &gdev->dev);
+}
+EXPORT_SYMBOL_GPL(gnss_deregister_device);
+
+/*
+ * Caller guarantees serialisation.
+ *
+ * Must not be called for a closed device.
+ */
+int gnss_insert_raw(struct gnss_device *gdev, const unsigned char *buf,
+ size_t count)
+{
+ int ret;
+
+ ret = kfifo_in(&gdev->read_fifo, buf, count);
+
+ wake_up_interruptible(&gdev->read_queue);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(gnss_insert_raw);
+
+static const char * const gnss_type_names[GNSS_TYPE_COUNT] = {
+ [GNSS_TYPE_NMEA] = "NMEA",
+ [GNSS_TYPE_SIRF] = "SiRF",
+ [GNSS_TYPE_UBX] = "UBX",
+};
+
+static const char *gnss_type_name(struct gnss_device *gdev)
+{
+ const char *name = NULL;
+
+ if (gdev->type < GNSS_TYPE_COUNT)
+ name = gnss_type_names[gdev->type];
+
+ if (!name)
+ dev_WARN(&gdev->dev, "type name not defined\n");
+
+ return name;
+}
+
+static ssize_t type_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct gnss_device *gdev = to_gnss_device(dev);
+
+ return sprintf(buf, "%s\n", gnss_type_name(gdev));
+}
+static DEVICE_ATTR_RO(type);
+
+static struct attribute *gnss_attrs[] = {
+ &dev_attr_type.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(gnss);
+
+static int gnss_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ struct gnss_device *gdev = to_gnss_device(dev);
+ int ret;
+
+ ret = add_uevent_var(env, "GNSS_TYPE=%s", gnss_type_name(gdev));
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int __init gnss_module_init(void)
+{
+ int ret;
+
+ ret = alloc_chrdev_region(&gnss_first, 0, GNSS_MINORS, "gnss");
+ if (ret < 0) {
+ pr_err("failed to allocate device numbers: %d\n", ret);
+ return ret;
+ }
+
+ gnss_class = class_create(THIS_MODULE, "gnss");
+ if (IS_ERR(gnss_class)) {
+ ret = PTR_ERR(gnss_class);
+ pr_err("failed to create class: %d\n", ret);
+ goto err_unregister_chrdev;
+ }
+
+ gnss_class->dev_groups = gnss_groups;
+ gnss_class->dev_uevent = gnss_uevent;
+
+ pr_info("GNSS driver registered with major %d\n", MAJOR(gnss_first));
+
+ return 0;
+
+err_unregister_chrdev:
+ unregister_chrdev_region(gnss_first, GNSS_MINORS);
+
+ return ret;
+}
+module_init(gnss_module_init);
+
+static void __exit gnss_module_exit(void)
+{
+ class_destroy(gnss_class);
+ unregister_chrdev_region(gnss_first, GNSS_MINORS);
+ ida_destroy(&gnss_minors);
+}
+module_exit(gnss_module_exit);
+
+MODULE_AUTHOR("Johan Hovold <johan@kernel.org>");
+MODULE_DESCRIPTION("GNSS receiver core");
+MODULE_LICENSE("GPL v2");
diff --git a/src/kernel/linux/v4.19/drivers/gnss/serial.c b/src/kernel/linux/v4.19/drivers/gnss/serial.c
new file mode 100644
index 0000000..31e891f
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/gnss/serial.c
@@ -0,0 +1,276 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Generic serial GNSS receiver driver
+ *
+ * Copyright (C) 2018 Johan Hovold <johan@kernel.org>
+ */
+
+#include <linux/errno.h>
+#include <linux/gnss.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/sched.h>
+#include <linux/serdev.h>
+#include <linux/slab.h>
+
+#include "serial.h"
+
+static int gnss_serial_open(struct gnss_device *gdev)
+{
+ struct gnss_serial *gserial = gnss_get_drvdata(gdev);
+ struct serdev_device *serdev = gserial->serdev;
+ int ret;
+
+ ret = serdev_device_open(serdev);
+ if (ret)
+ return ret;
+
+ serdev_device_set_baudrate(serdev, gserial->speed);
+ serdev_device_set_flow_control(serdev, false);
+
+ ret = pm_runtime_get_sync(&serdev->dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(&serdev->dev);
+ goto err_close;
+ }
+
+ return 0;
+
+err_close:
+ serdev_device_close(serdev);
+
+ return ret;
+}
+
+static void gnss_serial_close(struct gnss_device *gdev)
+{
+ struct gnss_serial *gserial = gnss_get_drvdata(gdev);
+ struct serdev_device *serdev = gserial->serdev;
+
+ serdev_device_close(serdev);
+
+ pm_runtime_put(&serdev->dev);
+}
+
+static int gnss_serial_write_raw(struct gnss_device *gdev,
+ const unsigned char *buf, size_t count)
+{
+ struct gnss_serial *gserial = gnss_get_drvdata(gdev);
+ struct serdev_device *serdev = gserial->serdev;
+ int ret;
+
+ /* write is only buffered synchronously */
+ ret = serdev_device_write(serdev, buf, count, MAX_SCHEDULE_TIMEOUT);
+ if (ret < 0)
+ return ret;
+
+ /* FIXME: determine if interrupted? */
+ serdev_device_wait_until_sent(serdev, 0);
+
+ return count;
+}
+
+static const struct gnss_operations gnss_serial_gnss_ops = {
+ .open = gnss_serial_open,
+ .close = gnss_serial_close,
+ .write_raw = gnss_serial_write_raw,
+};
+
+static int gnss_serial_receive_buf(struct serdev_device *serdev,
+ const unsigned char *buf, size_t count)
+{
+ struct gnss_serial *gserial = serdev_device_get_drvdata(serdev);
+ struct gnss_device *gdev = gserial->gdev;
+
+ return gnss_insert_raw(gdev, buf, count);
+}
+
+static const struct serdev_device_ops gnss_serial_serdev_ops = {
+ .receive_buf = gnss_serial_receive_buf,
+ .write_wakeup = serdev_device_write_wakeup,
+};
+
+static int gnss_serial_set_power(struct gnss_serial *gserial,
+ enum gnss_serial_pm_state state)
+{
+ if (!gserial->ops || !gserial->ops->set_power)
+ return 0;
+
+ return gserial->ops->set_power(gserial, state);
+}
+
+/*
+ * FIXME: need to provide subdriver defaults or separate dt parsing from
+ * allocation.
+ */
+static int gnss_serial_parse_dt(struct serdev_device *serdev)
+{
+ struct gnss_serial *gserial = serdev_device_get_drvdata(serdev);
+ struct device_node *node = serdev->dev.of_node;
+ u32 speed = 4800;
+
+ of_property_read_u32(node, "current-speed", &speed);
+
+ gserial->speed = speed;
+
+ return 0;
+}
+
+struct gnss_serial *gnss_serial_allocate(struct serdev_device *serdev,
+ size_t data_size)
+{
+ struct gnss_serial *gserial;
+ struct gnss_device *gdev;
+ int ret;
+
+ gserial = kzalloc(sizeof(*gserial) + data_size, GFP_KERNEL);
+ if (!gserial)
+ return ERR_PTR(-ENOMEM);
+
+ gdev = gnss_allocate_device(&serdev->dev);
+ if (!gdev) {
+ ret = -ENOMEM;
+ goto err_free_gserial;
+ }
+
+ gdev->ops = &gnss_serial_gnss_ops;
+ gnss_set_drvdata(gdev, gserial);
+
+ gserial->serdev = serdev;
+ gserial->gdev = gdev;
+
+ serdev_device_set_drvdata(serdev, gserial);
+ serdev_device_set_client_ops(serdev, &gnss_serial_serdev_ops);
+
+ ret = gnss_serial_parse_dt(serdev);
+ if (ret)
+ goto err_put_device;
+
+ return gserial;
+
+err_put_device:
+ gnss_put_device(gserial->gdev);
+err_free_gserial:
+ kfree(gserial);
+
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(gnss_serial_allocate);
+
+void gnss_serial_free(struct gnss_serial *gserial)
+{
+ gnss_put_device(gserial->gdev);
+ kfree(gserial);
+};
+EXPORT_SYMBOL_GPL(gnss_serial_free);
+
+int gnss_serial_register(struct gnss_serial *gserial)
+{
+ struct serdev_device *serdev = gserial->serdev;
+ int ret;
+
+ if (IS_ENABLED(CONFIG_PM)) {
+ pm_runtime_enable(&serdev->dev);
+ } else {
+ ret = gnss_serial_set_power(gserial, GNSS_SERIAL_ACTIVE);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret = gnss_register_device(gserial->gdev);
+ if (ret)
+ goto err_disable_rpm;
+
+ return 0;
+
+err_disable_rpm:
+ if (IS_ENABLED(CONFIG_PM))
+ pm_runtime_disable(&serdev->dev);
+ else
+ gnss_serial_set_power(gserial, GNSS_SERIAL_OFF);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(gnss_serial_register);
+
+void gnss_serial_deregister(struct gnss_serial *gserial)
+{
+ struct serdev_device *serdev = gserial->serdev;
+
+ gnss_deregister_device(gserial->gdev);
+
+ if (IS_ENABLED(CONFIG_PM))
+ pm_runtime_disable(&serdev->dev);
+ else
+ gnss_serial_set_power(gserial, GNSS_SERIAL_OFF);
+}
+EXPORT_SYMBOL_GPL(gnss_serial_deregister);
+
+#ifdef CONFIG_PM
+static int gnss_serial_runtime_suspend(struct device *dev)
+{
+ struct gnss_serial *gserial = dev_get_drvdata(dev);
+
+ return gnss_serial_set_power(gserial, GNSS_SERIAL_STANDBY);
+}
+
+static int gnss_serial_runtime_resume(struct device *dev)
+{
+ struct gnss_serial *gserial = dev_get_drvdata(dev);
+
+ return gnss_serial_set_power(gserial, GNSS_SERIAL_ACTIVE);
+}
+#endif /* CONFIG_PM */
+
+static int gnss_serial_prepare(struct device *dev)
+{
+ if (pm_runtime_suspended(dev))
+ return 1;
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int gnss_serial_suspend(struct device *dev)
+{
+ struct gnss_serial *gserial = dev_get_drvdata(dev);
+ int ret = 0;
+
+ /*
+ * FIXME: serdev currently lacks support for managing the underlying
+ * device's wakeup settings. A workaround would be to close the serdev
+ * device here if it is open.
+ */
+
+ if (!pm_runtime_suspended(dev))
+ ret = gnss_serial_set_power(gserial, GNSS_SERIAL_STANDBY);
+
+ return ret;
+}
+
+static int gnss_serial_resume(struct device *dev)
+{
+ struct gnss_serial *gserial = dev_get_drvdata(dev);
+ int ret = 0;
+
+ if (!pm_runtime_suspended(dev))
+ ret = gnss_serial_set_power(gserial, GNSS_SERIAL_ACTIVE);
+
+ return ret;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+const struct dev_pm_ops gnss_serial_pm_ops = {
+ .prepare = gnss_serial_prepare,
+ SET_SYSTEM_SLEEP_PM_OPS(gnss_serial_suspend, gnss_serial_resume)
+ SET_RUNTIME_PM_OPS(gnss_serial_runtime_suspend, gnss_serial_runtime_resume, NULL)
+};
+EXPORT_SYMBOL_GPL(gnss_serial_pm_ops);
+
+MODULE_AUTHOR("Johan Hovold <johan@kernel.org>");
+MODULE_DESCRIPTION("Generic serial GNSS receiver driver");
+MODULE_LICENSE("GPL v2");
diff --git a/src/kernel/linux/v4.19/drivers/gnss/serial.h b/src/kernel/linux/v4.19/drivers/gnss/serial.h
new file mode 100644
index 0000000..980ffdc
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/gnss/serial.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Generic serial GNSS receiver driver
+ *
+ * Copyright (C) 2018 Johan Hovold <johan@kernel.org>
+ */
+
+#ifndef _LINUX_GNSS_SERIAL_H
+#define _LINUX_GNSS_SERIAL_H
+
+#include <asm/termbits.h>
+#include <linux/pm.h>
+
+struct gnss_serial {
+ struct serdev_device *serdev;
+ struct gnss_device *gdev;
+ speed_t speed;
+ const struct gnss_serial_ops *ops;
+ unsigned long drvdata[0];
+};
+
+enum gnss_serial_pm_state {
+ GNSS_SERIAL_OFF,
+ GNSS_SERIAL_ACTIVE,
+ GNSS_SERIAL_STANDBY,
+};
+
+struct gnss_serial_ops {
+ int (*set_power)(struct gnss_serial *gserial,
+ enum gnss_serial_pm_state state);
+};
+
+extern const struct dev_pm_ops gnss_serial_pm_ops;
+
+struct gnss_serial *gnss_serial_allocate(struct serdev_device *gserial,
+ size_t data_size);
+void gnss_serial_free(struct gnss_serial *gserial);
+
+int gnss_serial_register(struct gnss_serial *gserial);
+void gnss_serial_deregister(struct gnss_serial *gserial);
+
+static inline void *gnss_serial_get_drvdata(struct gnss_serial *gserial)
+{
+ return gserial->drvdata;
+}
+
+#endif /* _LINUX_GNSS_SERIAL_H */
diff --git a/src/kernel/linux/v4.19/drivers/gnss/sirf.c b/src/kernel/linux/v4.19/drivers/gnss/sirf.c
new file mode 100644
index 0000000..4596fde
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/gnss/sirf.c
@@ -0,0 +1,411 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SiRFstar GNSS receiver driver
+ *
+ * Copyright (C) 2018 Johan Hovold <johan@kernel.org>
+ */
+
+#include <linux/errno.h>
+#include <linux/gnss.h>
+#include <linux/gpio/consumer.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/sched.h>
+#include <linux/serdev.h>
+#include <linux/slab.h>
+#include <linux/wait.h>
+
+#define SIRF_BOOT_DELAY 500
+#define SIRF_ON_OFF_PULSE_TIME 100
+#define SIRF_ACTIVATE_TIMEOUT 200
+#define SIRF_HIBERNATE_TIMEOUT 200
+
+struct sirf_data {
+ struct gnss_device *gdev;
+ struct serdev_device *serdev;
+ speed_t speed;
+ struct regulator *vcc;
+ struct gpio_desc *on_off;
+ struct gpio_desc *wakeup;
+ int irq;
+ bool active;
+ wait_queue_head_t power_wait;
+};
+
+static int sirf_open(struct gnss_device *gdev)
+{
+ struct sirf_data *data = gnss_get_drvdata(gdev);
+ struct serdev_device *serdev = data->serdev;
+ int ret;
+
+ ret = serdev_device_open(serdev);
+ if (ret)
+ return ret;
+
+ serdev_device_set_baudrate(serdev, data->speed);
+ serdev_device_set_flow_control(serdev, false);
+
+ ret = pm_runtime_get_sync(&serdev->dev);
+ if (ret < 0) {
+ dev_err(&gdev->dev, "failed to runtime resume: %d\n", ret);
+ pm_runtime_put_noidle(&serdev->dev);
+ goto err_close;
+ }
+
+ return 0;
+
+err_close:
+ serdev_device_close(serdev);
+
+ return ret;
+}
+
+static void sirf_close(struct gnss_device *gdev)
+{
+ struct sirf_data *data = gnss_get_drvdata(gdev);
+ struct serdev_device *serdev = data->serdev;
+
+ serdev_device_close(serdev);
+
+ pm_runtime_put(&serdev->dev);
+}
+
+static int sirf_write_raw(struct gnss_device *gdev, const unsigned char *buf,
+ size_t count)
+{
+ struct sirf_data *data = gnss_get_drvdata(gdev);
+ struct serdev_device *serdev = data->serdev;
+ int ret;
+
+ /* write is only buffered synchronously */
+ ret = serdev_device_write(serdev, buf, count, MAX_SCHEDULE_TIMEOUT);
+ if (ret < 0)
+ return ret;
+
+ /* FIXME: determine if interrupted? */
+ serdev_device_wait_until_sent(serdev, 0);
+
+ return count;
+}
+
+static const struct gnss_operations sirf_gnss_ops = {
+ .open = sirf_open,
+ .close = sirf_close,
+ .write_raw = sirf_write_raw,
+};
+
+static int sirf_receive_buf(struct serdev_device *serdev,
+ const unsigned char *buf, size_t count)
+{
+ struct sirf_data *data = serdev_device_get_drvdata(serdev);
+ struct gnss_device *gdev = data->gdev;
+
+ return gnss_insert_raw(gdev, buf, count);
+}
+
+static const struct serdev_device_ops sirf_serdev_ops = {
+ .receive_buf = sirf_receive_buf,
+ .write_wakeup = serdev_device_write_wakeup,
+};
+
+static irqreturn_t sirf_wakeup_handler(int irq, void *dev_id)
+{
+ struct sirf_data *data = dev_id;
+ struct device *dev = &data->serdev->dev;
+ int ret;
+
+ ret = gpiod_get_value_cansleep(data->wakeup);
+ dev_dbg(dev, "%s - wakeup = %d\n", __func__, ret);
+ if (ret < 0)
+ goto out;
+
+ data->active = !!ret;
+ wake_up_interruptible(&data->power_wait);
+out:
+ return IRQ_HANDLED;
+}
+
+static int sirf_wait_for_power_state(struct sirf_data *data, bool active,
+ unsigned long timeout)
+{
+ int ret;
+
+ ret = wait_event_interruptible_timeout(data->power_wait,
+ data->active == active, msecs_to_jiffies(timeout));
+ if (ret < 0)
+ return ret;
+
+ if (ret == 0) {
+ dev_warn(&data->serdev->dev, "timeout waiting for active state = %d\n",
+ active);
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static void sirf_pulse_on_off(struct sirf_data *data)
+{
+ gpiod_set_value_cansleep(data->on_off, 1);
+ msleep(SIRF_ON_OFF_PULSE_TIME);
+ gpiod_set_value_cansleep(data->on_off, 0);
+}
+
+static int sirf_set_active(struct sirf_data *data, bool active)
+{
+ unsigned long timeout;
+ int retries = 3;
+ int ret;
+
+ if (active)
+ timeout = SIRF_ACTIVATE_TIMEOUT;
+ else
+ timeout = SIRF_HIBERNATE_TIMEOUT;
+
+ do {
+ sirf_pulse_on_off(data);
+ ret = sirf_wait_for_power_state(data, active, timeout);
+ if (ret < 0) {
+ if (ret == -ETIMEDOUT)
+ continue;
+
+ return ret;
+ }
+
+ break;
+ } while (retries--);
+
+ if (retries < 0)
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+static int sirf_runtime_suspend(struct device *dev)
+{
+ struct sirf_data *data = dev_get_drvdata(dev);
+
+ if (!data->on_off)
+ return regulator_disable(data->vcc);
+
+ return sirf_set_active(data, false);
+}
+
+static int sirf_runtime_resume(struct device *dev)
+{
+ struct sirf_data *data = dev_get_drvdata(dev);
+
+ if (!data->on_off)
+ return regulator_enable(data->vcc);
+
+ return sirf_set_active(data, true);
+}
+
+static int __maybe_unused sirf_suspend(struct device *dev)
+{
+ struct sirf_data *data = dev_get_drvdata(dev);
+ int ret = 0;
+
+ if (!pm_runtime_suspended(dev))
+ ret = sirf_runtime_suspend(dev);
+
+ if (data->wakeup)
+ disable_irq(data->irq);
+
+ return ret;
+}
+
+static int __maybe_unused sirf_resume(struct device *dev)
+{
+ struct sirf_data *data = dev_get_drvdata(dev);
+ int ret = 0;
+
+ if (data->wakeup)
+ enable_irq(data->irq);
+
+ if (!pm_runtime_suspended(dev))
+ ret = sirf_runtime_resume(dev);
+
+ return ret;
+}
+
+static const struct dev_pm_ops sirf_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(sirf_suspend, sirf_resume)
+ SET_RUNTIME_PM_OPS(sirf_runtime_suspend, sirf_runtime_resume, NULL)
+};
+
+static int sirf_parse_dt(struct serdev_device *serdev)
+{
+ struct sirf_data *data = serdev_device_get_drvdata(serdev);
+ struct device_node *node = serdev->dev.of_node;
+ u32 speed = 9600;
+
+ of_property_read_u32(node, "current-speed", &speed);
+
+ data->speed = speed;
+
+ return 0;
+}
+
+static int sirf_probe(struct serdev_device *serdev)
+{
+ struct device *dev = &serdev->dev;
+ struct gnss_device *gdev;
+ struct sirf_data *data;
+ int ret;
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ gdev = gnss_allocate_device(dev);
+ if (!gdev)
+ return -ENOMEM;
+
+ gdev->type = GNSS_TYPE_SIRF;
+ gdev->ops = &sirf_gnss_ops;
+ gnss_set_drvdata(gdev, data);
+
+ data->serdev = serdev;
+ data->gdev = gdev;
+
+ init_waitqueue_head(&data->power_wait);
+
+ serdev_device_set_drvdata(serdev, data);
+ serdev_device_set_client_ops(serdev, &sirf_serdev_ops);
+
+ ret = sirf_parse_dt(serdev);
+ if (ret)
+ goto err_put_device;
+
+ data->vcc = devm_regulator_get(dev, "vcc");
+ if (IS_ERR(data->vcc)) {
+ ret = PTR_ERR(data->vcc);
+ goto err_put_device;
+ }
+
+ data->on_off = devm_gpiod_get_optional(dev, "sirf,onoff",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(data->on_off))
+ goto err_put_device;
+
+ if (data->on_off) {
+ data->wakeup = devm_gpiod_get_optional(dev, "sirf,wakeup",
+ GPIOD_IN);
+ if (IS_ERR(data->wakeup))
+ goto err_put_device;
+
+ /*
+ * Configurations where WAKEUP has been left not connected,
+ * are currently not supported.
+ */
+ if (!data->wakeup) {
+ dev_err(dev, "no wakeup gpio specified\n");
+ ret = -ENODEV;
+ goto err_put_device;
+ }
+
+ ret = regulator_enable(data->vcc);
+ if (ret)
+ goto err_put_device;
+
+ /* Wait for chip to boot into hibernate mode. */
+ msleep(SIRF_BOOT_DELAY);
+ }
+
+ if (data->wakeup) {
+ ret = gpiod_to_irq(data->wakeup);
+ if (ret < 0)
+ goto err_disable_vcc;
+ data->irq = ret;
+
+ ret = request_threaded_irq(data->irq, NULL, sirf_wakeup_handler,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ "wakeup", data);
+ if (ret)
+ goto err_disable_vcc;
+ }
+
+ if (IS_ENABLED(CONFIG_PM)) {
+ pm_runtime_set_suspended(dev); /* clear runtime_error flag */
+ pm_runtime_enable(dev);
+ } else {
+ ret = sirf_runtime_resume(dev);
+ if (ret < 0)
+ goto err_free_irq;
+ }
+
+ ret = gnss_register_device(gdev);
+ if (ret)
+ goto err_disable_rpm;
+
+ return 0;
+
+err_disable_rpm:
+ if (IS_ENABLED(CONFIG_PM))
+ pm_runtime_disable(dev);
+ else
+ sirf_runtime_suspend(dev);
+err_free_irq:
+ if (data->wakeup)
+ free_irq(data->irq, data);
+err_disable_vcc:
+ if (data->on_off)
+ regulator_disable(data->vcc);
+err_put_device:
+ gnss_put_device(data->gdev);
+
+ return ret;
+}
+
+static void sirf_remove(struct serdev_device *serdev)
+{
+ struct sirf_data *data = serdev_device_get_drvdata(serdev);
+
+ gnss_deregister_device(data->gdev);
+
+ if (IS_ENABLED(CONFIG_PM))
+ pm_runtime_disable(&serdev->dev);
+ else
+ sirf_runtime_suspend(&serdev->dev);
+
+ if (data->wakeup)
+ free_irq(data->irq, data);
+
+ if (data->on_off)
+ regulator_disable(data->vcc);
+
+ gnss_put_device(data->gdev);
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id sirf_of_match[] = {
+ { .compatible = "fastrax,uc430" },
+ { .compatible = "linx,r4" },
+ { .compatible = "wi2wi,w2sg0008i" },
+ { .compatible = "wi2wi,w2sg0084i" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, sirf_of_match);
+#endif
+
+static struct serdev_device_driver sirf_driver = {
+ .driver = {
+ .name = "gnss-sirf",
+ .of_match_table = of_match_ptr(sirf_of_match),
+ .pm = &sirf_pm_ops,
+ },
+ .probe = sirf_probe,
+ .remove = sirf_remove,
+};
+module_serdev_device_driver(sirf_driver);
+
+MODULE_AUTHOR("Johan Hovold <johan@kernel.org>");
+MODULE_DESCRIPTION("SiRFstar GNSS receiver driver");
+MODULE_LICENSE("GPL v2");
diff --git a/src/kernel/linux/v4.19/drivers/gnss/ubx.c b/src/kernel/linux/v4.19/drivers/gnss/ubx.c
new file mode 100644
index 0000000..12568ae
--- /dev/null
+++ b/src/kernel/linux/v4.19/drivers/gnss/ubx.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * u-blox GNSS receiver driver
+ *
+ * Copyright (C) 2018 Johan Hovold <johan@kernel.org>
+ */
+
+#include <linux/errno.h>
+#include <linux/gnss.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+#include <linux/serdev.h>
+
+#include "serial.h"
+
+struct ubx_data {
+ struct regulator *v_bckp;
+ struct regulator *vcc;
+};
+
+static int ubx_set_active(struct gnss_serial *gserial)
+{
+ struct ubx_data *data = gnss_serial_get_drvdata(gserial);
+ int ret;
+
+ ret = regulator_enable(data->vcc);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int ubx_set_standby(struct gnss_serial *gserial)
+{
+ struct ubx_data *data = gnss_serial_get_drvdata(gserial);
+ int ret;
+
+ ret = regulator_disable(data->vcc);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int ubx_set_power(struct gnss_serial *gserial,
+ enum gnss_serial_pm_state state)
+{
+ switch (state) {
+ case GNSS_SERIAL_ACTIVE:
+ return ubx_set_active(gserial);
+ case GNSS_SERIAL_OFF:
+ case GNSS_SERIAL_STANDBY:
+ return ubx_set_standby(gserial);
+ }
+
+ return -EINVAL;
+}
+
+static const struct gnss_serial_ops ubx_gserial_ops = {
+ .set_power = ubx_set_power,
+};
+
+static int ubx_probe(struct serdev_device *serdev)
+{
+ struct gnss_serial *gserial;
+ struct ubx_data *data;
+ int ret;
+
+ gserial = gnss_serial_allocate(serdev, sizeof(*data));
+ if (IS_ERR(gserial)) {
+ ret = PTR_ERR(gserial);
+ return ret;
+ }
+
+ gserial->ops = &ubx_gserial_ops;
+
+ gserial->gdev->type = GNSS_TYPE_UBX;
+
+ data = gnss_serial_get_drvdata(gserial);
+
+ data->vcc = devm_regulator_get(&serdev->dev, "vcc");
+ if (IS_ERR(data->vcc)) {
+ ret = PTR_ERR(data->vcc);
+ goto err_free_gserial;
+ }
+
+ data->v_bckp = devm_regulator_get_optional(&serdev->dev, "v-bckp");
+ if (IS_ERR(data->v_bckp)) {
+ ret = PTR_ERR(data->v_bckp);
+ if (ret == -ENODEV)
+ data->v_bckp = NULL;
+ else
+ goto err_free_gserial;
+ }
+
+ if (data->v_bckp) {
+ ret = regulator_enable(data->v_bckp);
+ if (ret)
+ goto err_free_gserial;
+ }
+
+ ret = gnss_serial_register(gserial);
+ if (ret)
+ goto err_disable_v_bckp;
+
+ return 0;
+
+err_disable_v_bckp:
+ if (data->v_bckp)
+ regulator_disable(data->v_bckp);
+err_free_gserial:
+ gnss_serial_free(gserial);
+
+ return ret;
+}
+
+static void ubx_remove(struct serdev_device *serdev)
+{
+ struct gnss_serial *gserial = serdev_device_get_drvdata(serdev);
+ struct ubx_data *data = gnss_serial_get_drvdata(gserial);
+
+ gnss_serial_deregister(gserial);
+ if (data->v_bckp)
+ regulator_disable(data->v_bckp);
+ gnss_serial_free(gserial);
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id ubx_of_match[] = {
+ { .compatible = "u-blox,neo-8" },
+ { .compatible = "u-blox,neo-m8" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ubx_of_match);
+#endif
+
+static struct serdev_device_driver ubx_driver = {
+ .driver = {
+ .name = "gnss-ubx",
+ .of_match_table = of_match_ptr(ubx_of_match),
+ .pm = &gnss_serial_pm_ops,
+ },
+ .probe = ubx_probe,
+ .remove = ubx_remove,
+};
+module_serdev_device_driver(ubx_driver);
+
+MODULE_AUTHOR("Johan Hovold <johan@kernel.org>");
+MODULE_DESCRIPTION("u-blox GNSS receiver driver");
+MODULE_LICENSE("GPL v2");